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A friend of mine made some of the 'BigFun' backloaded tractrix horns and uses Lowther PM6A's in them. These do bass below 40Hz when standing in corners. The downside is the size. These things are about 40" high, 40" deep and maybe 12-15" wide. Get a tape measure out and see how big that actually is. They do sound lovely with a 3W SE amp driving them. I'm sure the cabinets would work with the Fostex 8" units in them but they as a project it is a fairly major undertaking. (He had access to a £100,000 CNC Saw!) Doing it in 19 &amp; 25mm Ply with a jigsaw might be trickier.

The design &amp; construction tips for making these may be found on the web. The designer was someone called Ketil Parow. There is also a smaller 'Allfun' horn but I haven't heard those.

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can be used in a reasonable sized simple ported enclosure, although if they do interest you, wait until the new ones they have just released apear on the market.

spectrum audio is a really good site, guy there is very helpfull and fast delivery from germany aswell!

the Fostex FE-207 can be used in a ported enclosure aswell, MLTL are also on the cards aswell that should give you decent bass into the low 40's without having to have a horn.

if you dont play all that loud, the CSS FR125S is good, a 4.5" driver that will work in a ported or bipole of reasonable size (small compared to the others) but you will only really get around 90dB as it is only

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This weekend I received a pair of Fostex FE83 drivers to try in my 'Buschhorn' single driver backloaded horn project. I had been using some Visaton FRS 8's but I suspect these rather cute little Fostex drivers may be a good deal better.

Longer term I have some work to do with the rather lovely 500Hz tractrix horns that the woodmeister Kiang has kindly made for me.

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murray johnson wrote:

This weekend I received a pair of Fostex FE83 drivers to try in my 'Buschhorn' single driver backloaded horn project. I had been using some Visaton FRS 8's but I suspect these rather cute little Fostex drivers may be a good deal better.

Longer term I have some work to do with the rather lovely 500Hz tractrix horns that the woodmeister Kiang has kindly made for me.

I'll post progress as it happens.

i think you'll find the fruit is just going to fall straight out the bottom.

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murray johnson wrote:

This weekend I received a pair of Fostex FE83 drivers to try in my 'Buschhorn' single driver backloaded horn project. I had been using some Visaton FRS 8's but I suspect these rather cute little Fostex drivers may be a good deal better.

Longer term I have some work to do with the rather lovely 500Hz tractrix horns that the woodmeister Kiang has kindly made for me.

I'll post progress as it happens.

Horntastic! Those are gorgeous.
I really want to get my lugs on some speakers in that vein, just to see for myself what all the fuss is about. One day...

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There is an output at 20Hz, but it is very low about -30dB compared to the 50Hz and up flat response. The response below 40Hz drops, but it is there- I don't know whether there is enough low-frequency for you there.

The Sachiko has a better LF response, but it is bigger, and the plans are still being drawn. It should be fairly simple to build though- it is just flats and rigt-angles, no 43.5 degree type angles there.

There is a long discussion on the DIYaudio.com site about these, which can be accessed through the link above.

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Hi Keith,

Drivers mounted to 500Hz horns really need to be crossed over an octave higher ie 1KHz. I have some old alnico 1" JBL 2461's or of course the Vvox units either of which will be happy from 1KHz up. It's what you put below that is the issue. My current bass horns wouldn't really be happy going that high.

I've two options really. Ideally I'd get some larger 80 Hztractrix flares to run from 150Hz or so upwards with an appropriate 8-12" driver or make something like a Karlson or Fulmer style cabinet (see the Karlson website) with a high eff 12" in it. I have some Rola 12" field coil drivers I want to use so this may be theeasier option. I do have to work within the constraints of the room size I have ie 4x4.5m soI can't do anything silly.

On topic. BB this page is a good resource for single driver experimentation.

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a big audio nirvana driver (12") was quite a disappointing experience for me, lightweight and not very accurate in 250 liter box.

did you try them in open baffle? they are supposed to be good for that ;)

it performed much better with a different amp - dropping a classic jean hiraga amp (not sure but i think around 20W of pure class A) in instead of 2A3 SET brought abetter overall balance. it definitely has apotential - the overall tone is correct, for even response it just needs a carefuly tailored cabinet instead of a wierd, huge sextagonalbass reflex box. i have no other explanation why would a 8" fostex go subjectivelydeeper than AN.it also seems to benefit from a shorter listening distance - not really a nearfield, but close.